Photographic lens and electronic apparatus

Abstract

Provided are a photographic lens and an electronic apparatus including the photographic lens. The photographic lens includes a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a negative refractive power and an image-side surface that is concave toward an image-side; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power. The first, second, third, fourth, and fifth lenses are arranged sequentially from an object-side to the image-side. Each of the first, second, third, fourth, and fifth lenses has at least one aspherical surface.

What is claimed is: 
     
         1 . A photographic lens comprising:
 a first lens having a negative refractive power;   a second lens having a positive refractive power;   a third lens having a negative refractive power and an image-side surface that is concave toward an image-side;   a fourth lens having a positive refractive power; and   a fifth lens having a negative refractive power,   wherein the first, second, third, fourth, and fifth lenses are arranged sequentially from an object-side to the image-side, and each of the first, second, third, fourth, and fifth lenses has at least one aspherical surface.   
     
     
         2 . The photographic lens of  claim 1 , further comprising an aperture stop arranged between an object-side of the first lens and the second lens. 
     
     
         3 . The photographic lens of  claim 1 , wherein the photographic lens satisfies the following condition:
     RS 1/ RS 2>1,   wherein RS1 is a radius of curvature of an object-side surface of the first lens and RS2 is a radius of curvature of an image-side surface of the first lens.   
     
     
         4 . The photographic lens of  claim 1 , wherein the photographic lens satisfies the following condition:
   0.5 <FL 2 /EFL< 1,   wherein FL2 is a focal length of the second lens and EFL is an effective focal length of the photographic lens.   
     
     
         5 . The photographic lens of  claim 1 , wherein the photographic lens satisfies the following condition:
   0.1 <EFL/FL 23<1.1,   wherein EFL is an effective focal length of the photographic lens and FL23 is a combined focal length of the second lens and the third lens.   
     
     
         6 . The photographic lens of  claim 1 , wherein the photographic lens satisfies the following condition:
     V 2− V 3>25,
   wherein V2 is an Abbe number of the second lens and V3 is an Abbe number of the third lens.   
     
     
         7 . The photographic lens of  claim 1 , wherein the photographic lens satisfies the following condition:
   5 >TL 4/ TL 3>2,   wherein TL3 indicates a thickness of the third lens and TL4 indicates a thickness of the fourth lens.   
     
     
         8 . The photographic lens of  claim 1 , wherein the fifth lens has an object-side surface that is concave toward the object-side. 
     
     
         9 . The photographic lens of  claim 1 , wherein an image-side surface of the fifth lens has at least one inflection point. 
     
     
         10 . The photographic lens of  claim 9 , wherein the image-side surface of the fifth lens is concave toward the image-side near an optical axis. 
     
     
         11 . The photographic lens of  claim 1 , wherein the photographic lens has an angle of view equal to or greater than 80 degrees. 
     
     
         12 . The photographic lens of  claim 1 , wherein each of the first through fifth lenses has two aspherical lens surfaces. 
     
     
         13 . The photographic lens of  claim 1 , wherein each of the first through fifth lenses is a plastic lens. 
     
     
         14 . The photographic lens of  claim 1 , wherein the third lens is a biconcave lens or a meniscus lens. 
     
     
         15 . The photographic lens of  claim 1 , wherein the first lens is a meniscus lens that is convex toward the object-side. 
     
     
         16 . A photographic lens comprising:
 a first lens having a negative refractive power;   a second lens having a positive refractive power;   a third lens having a negative refractive power;   a fourth lens having a positive refractive power;   a fifth lens having a negative refractive power; and   an aperture stop arranged between an object-side surface of the first lens and the second lens,   wherein the first, second, third, fourth, and fifth lenses are arranged sequentially from an object-side to an image-side, and each of the first, second, third, fourth, and fifth lenses has at least one aspherical surface.   
     
     
         17 . The photographic lens of  claim 16 , wherein the photographic lens satisfies the following condition:
     RS 1/ RS 2>1,   wherein RS1 is a radius of curvature of the object-side surface of the first lens and RS2 is a radius of curvature of an image-side surface of the first lens.   
     
     
         18 . The photographic lens of  claim 16 , wherein the photographic lens satisfies the following condition:
   0.5< FL 2 /EFL< 1,   wherein FL2 is a focal length of the second lens and EFL is an effective focal length of the photographic lens.   
     
     
         19 . The photographic lens of  claim 16 , wherein the photographic lens satisfies the following condition:
   0.1 <EFL/FL 23<1.1,   where, EFL is an effective focal length of the photographic lens and FL23 is a combined focal length of the second lens and the third lens.   
     
     
         20 . An electronic apparatus comprising:
 the photographic lens of  claim 1 ; and   an image sensor that receives light that has passed through the photographic lens and converts the received light into an electrical image signal.